/* Layout: one 68rem reading column; overview uses full column, report pages keep prose near 40em. */
:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --ink: #15202d;
  --ink-2: #4a5566;
  --ink-3: #7a8494;
  --rule: #dfe3ea;
  --accent: #24467a;      /* 藍 */
  --accent-soft: #e6ecf5;
  --warn: #9a3b12;
  --warn-soft: #fbece4;
  --good: #1d6b3a;
  --good-soft: #e5f3ea;
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100; --s5: #e87ba4;
  --bar: #2a78d6;
  --font-display: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-data: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11161d; --surface: #19202a; --ink: #e8ecf2; --ink-2: #b4bdca; --ink-3: #8691a1;
    --rule: #2b3442; --accent: #8fb0e3; --accent-soft: #1f2b3d;
    --warn: #f0a07a; --warn-soft: #3a2219; --good: #7fd19e; --good-soft: #18301f;
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --bar: #3987e5;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #11161d; --surface: #19202a; --ink: #e8ecf2; --ink-2: #b4bdca; --ink-3: #8691a1;
  --rule: #2b3442; --accent: #8fb0e3; --accent-soft: #1f2b3d;
  --warn: #f0a07a; --warn-soft: #3a2219; --good: #7fd19e; --good-soft: #18301f;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --bar: #3987e5;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.75 var(--font-body);
  padding-inline: 16px; padding-block: 0 64px;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: 68rem; margin: 0 auto; }

.topbar {
  display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: baseline; justify-content: space-between;
  padding-block: 18px; border-bottom: 1px solid var(--rule);
}
.brand { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; color: var(--ink); text-decoration: none; }
.brand small { font-family: var(--font-body); font-weight: 400; color: var(--ink-3); font-size: .8rem; margin-left: 8px; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: .92rem; }
.nav a { text-decoration: none; color: var(--ink-2); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 600; border-bottom: 2px solid var(--accent); }

h1, h2, h3 { font-family: var(--font-display); text-wrap: balance; line-height: 1.35; }
h1 { font-size: clamp(1.7rem, 4.2vw, 2.6rem); margin: 40px 0 12px; }
h2 { font-size: clamp(1.3rem, 2.6vw, 1.7rem); margin: 56px 0 14px; }
h3 { font-size: 1.12rem; margin: 28px 0 8px; }
.eyebrow { font-size: .78rem; letter-spacing: .12em; color: var(--ink-3); text-transform: uppercase; }
.lede { font-size: 1.08rem; color: var(--ink-2); max-width: 46em; }
.num { font-family: var(--font-data); font-variant-numeric: tabular-nums; }

/* key figures */
.figures { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-top: 28px; }
.figure { background: var(--surface); padding: 18px 20px; min-width: 0; }
.figure b { display: block; font-family: var(--font-data); font-size: 1.7rem; font-weight: 600; line-height: 1.2; }
.figure span { color: var(--ink-2); font-size: .9rem; }

/* two paths */
.paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); gap: 16px; }
.path { background: var(--surface); border: 1px solid var(--rule); padding: 20px 22px; min-width: 0; }
.path.pick { border-color: var(--accent); box-shadow: inset 0 3px 0 var(--accent); }
.path h3 { margin-top: 0; }
.tag { display: inline-block; font-size: .75rem; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); margin-left: 6px; vertical-align: middle; font-family: var(--font-body); }
.path ul { padding-left: 1.2em; margin: 8px 0 0; color: var(--ink-2); }

/* charts */
.chart { background: var(--surface); border: 1px solid var(--rule); padding: 20px 22px; }
.chart-title { font-weight: 600; margin: 0 0 4px; }
.chart-sub { color: var(--ink-3); font-size: .85rem; margin: 0 0 16px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: .85rem; color: var(--ink-2); margin-bottom: 12px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: middle; }

.stack { display: flex; gap: 2px; height: 34px; }
.stack div { min-width: 2px; border-radius: 4px; }
.stack-labels { display: flex; gap: 2px; margin-top: 8px; font-size: .8rem; color: var(--ink-2); }
.stack-labels div { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.hbars { display: grid; grid-template-columns: minmax(7rem, 11rem) 1fr; gap: 10px 14px; align-items: center; }
.hbars .lab { font-size: .9rem; min-width: 0; }
.hbars .lab small { display: block; color: var(--ink-3); font-size: .78rem; }
.track { position: relative; height: 22px; }
.track .grid { position: absolute; inset: 0; background-image: linear-gradient(to right, var(--rule) 1px, transparent 1px); background-size: 25% 100%; }
.track .fill { position: absolute; left: 0; top: 3px; bottom: 3px; background: var(--bar); border-radius: 0 4px 4px 0; }
.track .val { position: absolute; top: 0; font-size: .82rem; line-height: 22px; padding-left: 8px; white-space: nowrap; color: var(--ink); }
.axis { display: grid; grid-template-columns: minmax(7rem, 11rem) 1fr; gap: 14px; font-size: .75rem; color: var(--ink-3); margin-top: 6px; }
.axis div:last-child { display: flex; justify-content: space-between; }

.scroll { overflow-x: auto; }
.cal { min-width: 640px; }
.cal-head, .cal-row { display: grid; grid-template-columns: 8.5rem 1fr; gap: 12px; align-items: center; }
.cal-head .months { display: grid; grid-template-columns: repeat(12, 1fr); font-size: .75rem; color: var(--ink-3); text-align: center; }
.cal-row { padding-block: 7px; border-top: 1px solid var(--rule); }
.cal-row .name { font-size: .88rem; }
.cal-row .lane { position: relative; height: 26px; background-image: linear-gradient(to right, var(--rule) 1px, transparent 1px); background-size: calc(100% / 12) 100%; }
.cal-row .seg { position: absolute; top: 4px; bottom: 4px; border-radius: 4px; }
.cal-events { position: relative; height: 34px; margin-left: calc(8.5rem + 12px); }
.cal-events span { position: absolute; top: 0; font-size: .72rem; color: var(--ink-2); white-space: nowrap; transform: translateX(-50%); border-top: 2px solid var(--ink-3); padding-top: 2px; }

/* tables */
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--rule); }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; color: var(--ink-2); background: var(--accent-soft); white-space: nowrap; }
td.n, th.n { text-align: right; font-family: var(--font-data); font-variant-numeric: tabular-nums; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; border-left: 2px solid var(--rule); }
.steps li { position: relative; padding: 4px 0 16px 22px; }
.steps li::before { content: attr(data-n); position: absolute; left: -13px; top: 4px; width: 24px; height: 24px; border-radius: 50%; background: var(--surface); border: 2px solid var(--accent); color: var(--accent); font: 600 .72rem/20px var(--font-data); text-align: center; }
.steps time { font-family: var(--font-data); font-size: .82rem; color: var(--ink-3); display: block; }

.callout { padding: 14px 18px; border-left: 3px solid var(--warn); background: var(--warn-soft); margin: 18px 0; }
.callout.good { border-color: var(--good); background: var(--good-soft); }
.callout p { margin: 0; }

.cases { display: grid; grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); gap: 16px; }
.case { background: var(--surface); border: 1px solid var(--rule); padding: 18px 20px; min-width: 0; }
.case h3 { margin: 0 0 2px; }
.case .site { font-size: .85rem; }
.case dl { display: grid; grid-template-columns: 4.5em 1fr; gap: 4px 10px; margin: 12px 0 0; font-size: .88rem; }
.case dt { color: var(--ink-3); }
.case dd { margin: 0; min-width: 0; }
.case.bad { border-style: dashed; }

.links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.btn { display: inline-block; padding: 9px 16px; border: 1px solid var(--accent); color: var(--accent); text-decoration: none; border-radius: 6px; font-size: .92rem; }
.btn.primary { background: var(--accent); color: var(--surface); }

#tip { position: fixed; pointer-events: none; z-index: 10; background: var(--ink); color: var(--bg); font-size: .8rem; padding: 6px 10px; border-radius: 6px; max-width: 18rem; line-height: 1.5; }
[data-tip] { cursor: default; }

/* report prose */
.prose { max-width: 46em; }
.prose p, .prose li { color: var(--ink); }
.prose blockquote { margin: 18px 0; padding: 10px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); color: var(--ink-2); }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 40px 0; }
.prose .table-wrap { margin: 16px 0; max-width: none; }
.report-layout { display: grid; grid-template-columns: minmax(0, 1fr) 15rem; gap: 40px; align-items: start; }
.toc { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 16px); font-size: .85rem; border-left: 1px solid var(--rule); padding-left: 16px; margin-top: 40px; }
.toc ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.toc a { color: var(--ink-2); text-decoration: none; }
@media (max-width: 900px) { .report-layout { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }

footer { margin-top: 64px; padding-top: 18px; border-top: 1px solid var(--rule); color: var(--ink-3); font-size: .82rem; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }

/* paired bars (two series per row), scale 0–35% */
.track.pair { height: 40px; }
.track.pair .grid { background-size: 28.571% 100%; }
.track.pair .fill { top: auto; bottom: auto; height: 16px; }
.track.pair .fill.a { top: 2px; background: var(--s1); }
.track.pair .fill.b { top: 22px; background: var(--s2); }
.track.pair .val { line-height: 16px; }
.track.pair .val.a { top: 2px; }
.track.pair .val.b { top: 22px; }
.axis .ticks { position: relative; height: 1.2em; display: block; }
.axis .ticks span { position: absolute; transform: translateX(-50%); }
.axis .ticks span:first-child { transform: none; }